Orientite is a rare manganese silicate mineral typically occurring as small brown tabular crystals or radial clusters. It is highly valued by mineral collectors for its scarcity and is famously associated with manganese-rich deposits in Cuba and the Franklin Mining District.
Is this orientite?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch orientite with a known reference. Orientite sits at Mohs 3.5-4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Orientite leaves a yellowish brown streak.
- 3Read the lusterHold the specimen under a strong light. Orientite typically shows a vitreous to pearly luster.
- 4Match the color rangeCompare against the expected color range: brown, dark brown.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: tabular crystals, radial aggregates.
Often confused with
Orientite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Epidote is the harder of the two (Mohs 6-7 vs. 3.5-4); streak differs — Orientite leaves yellowish brown, Epidote leaves white; luster reads vitreous to pearly on Orientite and vitreous on Epidote.
How to tell apart: Piemontite is the harder of the two (Mohs 6-6.5 vs. 3.5-4); streak differs — Orientite leaves yellowish brown, Piemontite leaves reddish-brown; luster reads vitreous to pearly on Orientite and vitreous on Piemontite.
Often found alongside orientite
Minerals reported to co-occur with orientite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Ca₂Mn³⁺₆O₈(Si₄O₁₂)·4H₂O
- Mohs hardness
- 3.5-4
- Density
- 3.48 g/cm³
- Colors
- Streak
- Yellowish Brown
- Luster
- Vitreous to Pearly
- Transparency
- Translucent
- Crystal system
- Orthorhombic
- Crystal habit
- Tabular Crystals, Radial Aggregates
- Cleavage
- Perfect On {010}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Manganese Deposits in Sedimentary or Metamorphic Environments
- Typical price
- $50-300 per specimen
Where rockhounds find orientite
Classic worldwide localities
- Oriente Province, Cuba
- Franklin, New Jersey, USA
Field-hunting tip
Look in manganese deposits in sedimentary or metamorphic environments country — that is the host setting where orientite typically forms. If you start seeing calcite, hausmannite, braunite in float, you are in the right ground. Field specimens usually show a tabular crystals, radial aggregates habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify orientite?+
Where is orientite found?+
How much is orientite worth?+
What rocks look like orientite?+
What minerals are found with orientite?+
What kind of rock does orientite form in?+
What is orientite used for?+
Find orientite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
